lint dbg and prints

[tzemanovic]

Describe your changes

closes #3227

also fixes some rust 2018 idioms and missing docs

Indicate on which release or other PRs this topic is based on

#3214

diff: https://github.com/anoma/namada/pull/3257/files/860132bdfce5e91864bc07808610a39289bd2797..a1c534c52efcf0d8a2797a6f3b976ef6e831b7d2

Checklist before merging to draft

• I have added a changelog
• Git history is in acceptable state

[codecov]

Codecov Report

Attention: Patch coverage is 73.34184% with 209 lines in your changes are missing coverage. Please review.

Project coverage is 60.26%. Comparing base (4ed6229) to head (a1c534c).

Files	Patch %	Lines
crates/namada/src/vm/host_env.rs	82.01%	25 Missing ⚠️
...s/apps/src/lib/node/ledger/shell/finalize_block.rs	60.52%	15 Missing ⚠️
crates/sdk/src/masp.rs	0.00%	13 Missing ⚠️
crates/namada/src/ledger/vp_host_fns.rs	63.33%	11 Missing ⚠️
crates/tx/src/types.rs	68.57%	11 Missing ⚠️
crates/apps/src/lib/node/ledger/shell/mod.rs	70.96%	9 Missing ⚠️
crates/governance/src/cli/validation.rs	0.00%	9 Missing ⚠️
crates/apps/src/lib/config/genesis/chain.rs	33.33%	8 Missing ⚠️
crates/apps/src/lib/node/ledger/mod.rs	0.00%	8 Missing ⚠️
crates/namada/src/ledger/mod.rs	38.46%	8 Missing ⚠️
... and 28 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3257      +/-   ##
==========================================
+ Coverage   60.24%   60.26%   +0.02%     
==========================================
  Files         303      303              
  Lines       93191    93453     +262     
==========================================
+ Hits        56145    56323     +178     
- Misses      37046    37130      +84     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[brentstone]

LGTM